C Random Number Generator Routines

**C_RANDOM**
is a directory of C programs which
illustrate the use of the C random number generator routines.

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

**C_RANDOM** is available in
a C version and
a C++ version and
a FORTRAN90 version and
a MATLAB version.

ASA183, a C library which implements a pseudorandom number generator, by Wichman and Hill. This is a version of Applied Statistics Algorithm 183.

NORMAL, a C library which computes elements of a sequence of pseudorandom normally distributed values.

RAND48, a C program which demonstrates the use of the rand48 family of random number generators available in the C/C++ standard library.

RANDLC, a C library which generates a sequence of pseudorandom numbers, used by the NAS Benchmark programs.

RNGLIB, a C library which implements a random number generator (RNG) with splitting facilities, allowing multiple independent streams to be computed, by L'Ecuyer and Cote.

UNIFORM, a C library which computes elements of a uniform pseudorandom sequence.

VAN_DER_CORPUT, a C library which computes elements of a 1D van der Corput Quasi Monte Carlo (QMC) sequence using a simple interface.

**DRAND48_TEST** shows how to use the standard library routines
SRAND48 to set the seed and DRAND48 to return random real numbers in [0,1].

- drand48_test.c, the source code;
- drand48_test_output.txt, the output file.

**RAND_DEFECT** points out a minor problem with generating real numbers
by calling TIME to seed SRAND and then dividing RAND() by RANDMAX, namely,
the first value returned will be about the same every time you run the
program:

- rand_defect.c, the source code;
- rand_defect_output.txt, the output file;

**RAND_TEST** shows how to use the standard library routines
SRAND to set the seed and RAND to return random integers which
can be scaled to real numbers in [0,1].

- rand_test.c, the source code;
- rand_test_output.txt, the output file.

**RANDOM_TEST** shows how to use the standard library routines
SRANDOM to set the seed and RANDOM to return random integers which
can be scaled to real numbers in [0,1].

- random_test.c, the source code;
- random_test_output.txt, the output file.

You can go up one level to the C source codes.